/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.service;

import org.apache.iotdb.commons.exception.ShutdownException;
import org.apache.iotdb.commons.exception.StartupException;
import org.apache.iotdb.commons.utils.TestOnly;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class RegisterManager {

    private static final Logger logger = LoggerFactory.getLogger(RegisterManager.class);
    private final List<IService> iServices;
    private static long deregisterTimeOut = 10_000L;

    public RegisterManager() {
        iServices = new ArrayList<>();
    }

    /**
     * register service.
     */
    public void register(IService service) throws StartupException {
        for (IService s : iServices) {
            if (s.getID() == service.getID()) {
                logger.debug("{} has already been registered. skip", service.getID().getName());
                return;
            }
        }
        iServices.add(service);
        service.start();
    }

    /**
     * stop all service and clear iService list.
     */
    public void deregisterAll() {
        // we stop JMXServer at last
        Collections.reverse(iServices);
        for (IService service : iServices) {
            try {
                service.waitAndStop(deregisterTimeOut);
                logger.debug("{} deregistered", service.getID());
            } catch (Exception e) {
                logger.error("Failed to stop {} because:", service.getID().getName(), e);
            }
        }
        iServices.clear();
        logger.info("deregister all service.");
    }

    /**
     * stop all service and clear iService list.
     */
    public void shutdownAll() throws ShutdownException {
        // we stop JMXServer at last
        Collections.reverse(iServices);
        for (IService service : iServices) {
            service.shutdown(deregisterTimeOut);
        }
        iServices.clear();
        logger.info("deregister all service.");
    }

    @TestOnly
    public static void setDeregisterTimeOut(long deregisterTimeOut) {
        RegisterManager.deregisterTimeOut = deregisterTimeOut;
    }
}
